血小板增多症在小儿时期少见,原发性血小板增多症更为罕见。现将我院先后收治的8例综合报道如下。临床资料(见表)。典型病例,男,6岁,以反复鼻出血三年,咯血便血四天入院。查体:轻度贫血貌,皮肤无出血点、皮疹和黄染,心肺正常,肝肋下1厘米,脾肋下0.5厘米,WBC8.4×10~9/L,分类无异常,Hb103g/L,红细胞压积30%,血小板800～1040×10~9/L。骨穿:增生明显活跃,粒∶红1.3∶1,巨核细胞明显增多, Thrombocytosis is rare in infancy, and polypoid thrombocytopenia is more rare. Now our hospital has admitted 8 cases reported as follows. Clinical data (see table). Typical cases, male, 6 years old, with repeated epistaxis for three years, four days of hemoptysis and blood stool admission. Examination: mild anemia appearance, skin no bleeding point, rash and yellow dye, normal heart and lung, liver 1 cm, 0.5 cm spleen ribs, WBC8.4 × 10 ~ 9 / L, no abnormalities, Hb103g / L , Hematocrit 30%, platelets 800 ~ 1040 × 10 ~ 9 / L. Bone wear: significantly hyperplasia, granule: red 1.3: 1, megakaryocytes increased significantly,